Hefner said in a Twitter message early Sunday that he'd given aring to girlfriend and Playmate Crystal Harris, saying she burstinto tears.

"This is the happiest Christmas weekend in memory," hewrote.

To clear up confusion over whether the ring was simply aChristmas gift, Hefner later tweeted: "Yes, the ring I gave Crystalis an engagement ring. I didn't mean to make a mystery out of it. Avery merry Christmas to all."

This would be the third marriage for the 84-year-old, star of E!reality series "The Girls Next Door," which chronicles Hefner'slife at the Playboy Mansion. He divorced Playmate Kimberly Conradlast year.